Answer: Please see answer below
Explanation:
<u>Oil Reserve </u>$3,000,000 for year 1, 2, 3
<u> Accumulated Depletion </u> 
Year 1 = $3,000,000/50,000 X 10,000= $600,000
 Year 2 = 3,000,000/50,000 X 30,000+600,000=$2,400,000
Year 3 =3,000,000/50,000 X 10,000+ 2,400,000= $3,000,000
<u>Oil Reserve</u>
Year 1 =$3000000- $600,000=$2,400,000
Year 2, $3,000,000- $2,400,000=$600,000
Year 3= $3,000,000 -$3, 000,000=$0
<u>Net Oil Inventory</u>
 Year 1= $600,000 
Year 2 $2,400,000 
Year 3= $3,000,000
                                           Year 1          Year 2         Year 3
 Oil Reserve        $3,000,000          $3,000,000      $3,000,000
Accumulated Depletion $600,000   $2,400,000     $3,000,000
Oil Reserve,               $2,400,000             $600,000         $0
 Net Oil Inventory      $600,000        $2,400,000     $3,000,000